IIR document

Separation of radiative contribution in heat transfer in polyurethanes.


Ageing of an insulation material depends on conduction through the gas in the cells. This conduction depends on the composition of the gas of the cells. As all the parameters that characterize heat transfer in polyurethanes are temperature-dependent, the identification of radiation heat transfer parameters in the preliminary experimental work is possible only when the conductivity of the enclosed gas is well known. For this purpose measurements of thermal resistance at different thicknesses and temperatures were made on some boards blown with CO2 and aged enough to have just air in the cells. The experimental results were analyzed by the least square analysis and confidence intervals were calculated for some parameters. Correlations of some parameters are also shown in graphical form. The parameters identified with the preliminary work may then be introduced in interpolating equations, so that, in routine testing, ageing phenomena may be identified.

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  • Original title: Separation of radiative contribution in heat transfer in polyurethanes.
  • Record ID : 1995-2195
  • Languages: English
  • Source: CFCs, the Day After.
  • Publication date: 1994/09/21
  • Document available for consultation in the library of the IIR headquarters only.


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